1 “... still, fluorine. Produced by ubiquitous marine (algae, sponges, corals, bryozoa, nudibranchs, fungi...”

2 “.... The last one discusses the endogenous natural products that are produced by human cells including...”

3 “... and chemistry, including biosynthesis and total synthesis of secondary metabolites produced in culture. It also...”

4 “... of the genus Xanthium, which produces interesting sulfur and nitrogen containing natural products. Finally...”

5 “... American newt species that both produce tetrodotoxin, a well-known neurotoxin that causes paralysis...”